JPS6214326A - Optical disk driving device - Google Patents

Abstract

PURPOSE:To reduce an error rate for the reproduction of information by providing a driving means which shifts a cleaning means to a position where a contact is secured with the disk surface in response to the action signal given from a host device owing to a reproduction error. CONSTITUTION:An optical disk controller 20 contains a reproduction error detector which decides whether the received information is correct or not. The controller 20 gives an instruction to an optical disk driving device 21 to clean the surface of an optical disk 1 via a brush 6 and to retry reproduction in case the reproduction is wrong due to the wrong information. When receiving said instruction, the driving device 21 lifts the brush 6 up to a position where the contact is secured with the surface of the disk 1 by means of a solenoid 5 in order to remove the dust, etc. Then the brush 6 is detached again from the surface of the disk 1. The brush 6 is kept contact with the surface of the disk 1 only when a reproduction error is produced. Other wise the brush 6 is kept away from the surface of the disk 1. This prevents the undesired damage given to the disk 1 and reduces the error ratio for the reproduction of information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an optical disc drive device, and more particularly, to an optical disc drive device suitable for preventing the influence of dust on the disc surface during information reproduction.

[Background of the invention]

Conventional optical disc drives have a problem in that if the information recorded on the disc is affected by dust, dirt, etc. adhering to the disc surface, the information cannot be reproduced normally. This is a loss of information, and has been an obstacle to achieving a low error rate for optical disk drives that handle code data. In order to solve this problem of dust, etc., a method is known in which a disk cleaner is attached to a part of the head arm that holds the reading head to remove dust and the like (see Japanese Patent Laid-Open No. 71528/1983). . In this method, the cleaning member is attached to the front part of the head of the helad arm, and a soft member made of velvet cloth is glued to the surface of the cleaning member that contacts the disk. It has become. In an optical disc playback device having such a disc cleaning section, the soft member is always in contact with the disc surface while the disc is rotating, so the disc surface unnecessarily slides against the soft member, causing damage to the disc surface. There is a risk of injury.

[Purpose of the invention]

The purpose of the present invention is to improve such conventional problems, remove dust and dirt on the disc surface that causes unreproducibility or erroneous reproduction when information is reproduced, and prevent information from being damaged without unnecessary damage to the disc surface. An object of the present invention is to provide an optical disc drive device that reduces the reproduction error rate.

[Summary of the invention]

In order to achieve the above object, an optical disc drive device of the present invention is an optical disc drive device that records or reproduces information on a disc by light irradiation from an optical head, and is movable in a direction perpendicular to the disc surface facing the optical disc surface. and a cleaning means provided at the disk surface, and the cleaning means is normally held at a position separated from the disk surface, and the cleaning means is brought into contact with the disk surface in response to an operation signal from a host device associated with a playback error. It is characterized in that it includes a drive means for moving it to a certain position.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a configuration diagram of an optical disk storage system consisting of an optical disk control device and a plurality of optical disk drives connected as subordinate devices thereof.

In FIG. 2, numeral 20 is an optical disc control device equipped with a reproduction error detector for detecting reproduction errors in a plurality of optical disc drives, and 21 is an optical disc drive equipped with a disc cleaning tool drive means according to the present invention.

The optical disc control device 20 controls a plurality of optical disc drive bags W.
Connected to 121, optical disc drive bag! 21 controls the transfer of information recorded and reproduced. In addition, when reproducing information from the optical disc loaded in the optical disc drive device 21, if a reproduction error such as unreproducibility or erroneous reproduction occurs, the optical disc control bag [2], which is a host device,
A reproduction error detector within 0 is used to detect reproduction errors. If the detected playback error is due to dust or dirt on the disc surface, the cleaning tool driving means in the optical disc drive device 21 according to the present invention removes the dust, dirt, etc. and cleans it. This example will be described in detail below.

FIG. 1 is a schematic configuration diagram of an optical disc drive device according to this embodiment. This is a detailed explanation of the present invention of the optical disk drive device shown in FIG. 2. FIG. (b) shows the case where the brush is in contact with the disk surface.

In FIGS. 1(a) and (b), 1 is an optical disk on which data is recorded, 2 is a motor that rotates the optical disk, 3 is an optical disk cartridge in which the optical disk 2 is stored, and 4 is movable in the radial direction of the optical disk. 5 is an optical head 4 for writing and reading information provided in the
a solenoid that moves in the radial direction of the optical disk along with the optical disk;
is a brush as an example of a cleaning tool means that is glued to the tip of the solenoid 5 and can be moved up and down by moving the solenoid 5;
Reference numeral 7 denotes a hub that holds down a hole that is the center of the rotation axis of the optical disc 1.

FIG. 3 is a top view of the optical disc drive device of FIG. 1. Here, arrow a indicates the rotation direction of the optical disc 1, and when the optical disc 1 rotates in the direction of arrow a during information reproduction, the brush 6 cleans on the same trajectory as the objective lens section 4' of the optical head 4. It is arranged so that it can be used.

Therefore, when a reproduction error occurs, by raising the brush 5 at that position, the disk surface including the error track can be partially cleaned.

The motor 2 rotates the optical disc 1 in the direction a in FIG. Information is recorded on the recording film of the optical disc 1, and the optical head 4 reproduces this information and records the information on the recording film. When reproducing information, the optical head 4
If there is dust or dirt on the surface of the optical disc 2, it will not be possible to play it correctly. Therefore, as shown in Figure 2,
The optical disc drive device 21 sends the incorrect information to the upper optical disc control device 20. The optical disc control device 20 includes a playback error detector that determines whether the sent information is correct or not. If the information is incorrect and erroneous playback occurs, the optical disc drive device detects whether the optical disc is removed by a brush 6 or not. 1. Order to clean the surface of No. 1 and try regenerating glue. Upon receiving this command, the optical disk drive device 21 uses the solenoid 5 to lift the brush 6 to a position where it comes into contact with the surface of the optical disk 1, removes dust, etc. (the state shown in FIG. 3(b)), and returns to the state shown in FIG. 3(a). ) as shown in the optical disc 2
away from the surface. After that, playback is performed. In this way, only when a playback error occurs, the brush 6 is brought into "contact" with the surface of the optical disc 1, and at other times, the brush 6 is brought "away" from the surface of the optical disc 1. By keeping it in this condition, there is no need to worry about unnecessary scratches on the optical disc surface.

FIG. 4 is a flowchart when cleaning/regeneration retry is performed up to M times according to this embodiment. This will be explained below using a flowchart.

First, the retry counter (
(not shown) is set to '0'' (step 401),
Detecting a signal from the optical herad 4 (step 402),
Information is reproduced (step 403).

Next, the optical disc control bag from the optical disc drive device 21!
20 (step 404), and a reproduction error detection circuit within the optical disc control device 20 detects a reproduction error (step 405).

If there is no playback error, proceed directly to processing step 403
If a reproduction error occurs, the value of the retry counter is incremented by LL (step 406), and that value is compared with a preset number of tries M (step 406). 407)
, if it is less than the set value M, the optical disc control device 20 issues a cleaning means drive command to the optical disc drive bag [21].

When the optical disk drive device 21 receives this command to drive the cleaning means, the brush 6 is moved to the optical disk 1 by the solenoid 5.
(See Figure 3 (b))
, the surface of the optical disc 1 is cleaned with the brush 6 (step 409). This cleaning is performed only when a playback error occurs. After that, playback is performed (step 402
), and when the value of the retry counter (not shown) becomes larger than the set value M in processing step 407, an error occurrence display is displayed to notify the operator and the above processing is interrupted.

FIG. 5 shows another embodiment, in which cleaning tool means large enough to clean all the tracks of an optical disk at once is provided independently from the optical head 4 of the optical disk drive device 21. This device includes a brush 6 as an example of a cleaning device that is operated independently when a playback error occurs, and when a playback error occurs, the brush 6 is moved in the direction of the disk surface to clean the surface of the optical disk 1. be. Other processing is the same as in Figure 4, so please refer to it.
The rest of the configuration is the same as that in FIG. 3, so the explanation will be omitted.

In this manner, in this embodiment, the surface of the optical disc 1 is cleaned with the brush 6 only when a reproduction error occurs, so there is no need to worry about unnecessary scratches on the surface of the optical disc 1. In addition, information that was conventionally determined to be unreproducible can now be reproduced, which is the goal for optical disc drives. −8− Error rate can be achieved.

〔Effect of the invention〕

As explained above, according to the present invention, when an optical disk drive device plays back information, it is possible to remove dust and dirt from the disk surface that causes playback failure or erroneous playback, and to prevent unnecessary damage to the disk surface. The playback error rate can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an optical disk drive device showing an embodiment of the present invention, and FIG. 2 is a diagram showing a configuration in which a plurality of optical disk control devices as a host device to which the present invention is applied and a plurality of optical disk drive devices as a lower device are combined. System configuration diagram, Figure 3 is the first
FIG. 4 is a flowchart from detecting a playback error to driving the cleaning tool according to the present embodiment, and FIG. 5 is a diagram for explaining another embodiment. 1: Optical disc, 2: Motor, 3: Optical disc cartridge, 4: Optical head, 5: Solenoid, 6: Brush, 7
:Hub. Figure 4 Figure 3

Claims (1)

[Claims] (1) In an optical disk drive device that records or reproduces information on a disk by irradiating light from an optical head, a cleaning means is provided facing the optical disk surface so as to be movable in a direction perpendicular to the disk surface, and the above-mentioned cleaning means is provided at all times. and a drive means for holding the cleaning means at a position apart from the disk surface and moving the cleaning means to a position in contact with the disk surface in response to an operation signal from a host device associated with a playback error. Optical disk drive device.